I'm sad about how smartphones have turned out. The effects are entirely dependent on how they are used. If used as a portable information retrieval device, camera, and communications tool, they make us smarter than ever before. But it seems most people have instead chosen to focus on attention-stealing data collection apps that encourage neuroticism, narcissism, and anxiety.
We had envisioned something like PADDs on Star Trek or the Hitchhiker's Guide to the Galaxy, but what we got was an jingly electronic mirror that bullies you. I don't know how we are so okay with this. Keeping phones out of schools is not the cure. Keeping evil and harmful apps off the phones is a more precise solution.